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- W2086029560 abstract "This chapter discusses plasma waves and echoes. The complexity of plasma physics is reflected in the waves that exist in plasmas. At any frequency, two transverse modes corresponding to electromagnetic waves and one longitudinal mode can in general be present. The longitudinal waves, which exist only in matter, are most sensitive to the properties of the plasma. Both density and temperature can be measured without affecting the plasma. In some cases, details of the distribution function and fluctuation spectrum can be inferred from wave measurements. The equations for a collisionless plasma comprise Vlasov equations for the electron and ion distribution functions and Maxwell's equations for the fields. For longitudinal modes, the only nontrivial field equation is the Poisson equation. The observation of echoes is inherently no more difficult than observing the primary waves themselves, although some requirements are somewhat more stringent. The plasma must be large and truly collisionless. To observe the primary wave, a plasma only a few damping lengths long suffices. The scale must be increased by an order of magnitude to observe echoes. The great sensitivity of the echo to collisions requires that the mean free path really be longer than the device. If collisional damping is detectable in the primary waves, it will probably destroy the echo." @default.
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- W2086029560 date "1965-12-01" @default.
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- W2086029560 title "On the theory of pulse stimulated radiation from a plasma" @default.
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